Expressions

Classes
class	RWDBAssignment
	Represents the result of applying the RWDBColumn::assign() method to an RWDBExpr. More...
class	RWDBBoundExpr
	Acts as a placeholder in a dynamic SQL statement, providing a type-safe interface for binding a local variable to a dynamic SQL statement. More...
class	RWDBCollectableExpr
	Adds RWCollectable semantics to RWDBExpr. More...
class	RWDBCriterion
	Represents the result of applying logical operators to RWDBExpr. It encapsulates search conditions that are used in SQL WHERE clauses and CHECK constraints. More...
class	RWDBCritFormDefinition
	Base class for a family of classes used to define functional notation for RWDBCriterion. More...
class	RWDBCritFuncDef0
	Specialization of the base class RWDBCritFormDefinition used for defining SQL functions taking no parameters. More...
class	RWDBCritFuncDef1
	Specialization of the base class RWDBCritFormDefinition used for defining SQL functions taking 1 parameter. More...
class	RWDBCritFuncDef2
	Specialization of the base class RWDBCritFormDefinition used for defining SQL functions taking 2 parameters. More...
class	RWDBCritFuncDef3
	Specialization of the base class RWDBCritFormDefinition used for defining SQL functions taking 3 parameters. More...
class	RWDBCritFuncDef4
	Specialization of the base class RWDBCritFormDefinition used for defining SQL functions taking 4 parameters. More...
class	RWDBExpr
	A C++ representation of expressions used in constructing SQL statements. More...
class	RWDBExprFormDefinition
	Base class for a family of classes that defines functional notation for RWDBExpr. More...
class	RWDBExprFuncDef0
	Specialization of the base class RWDBExprFormDefinition used to define SQL functions that take no parameters. More...
class	RWDBExprFuncDef1
	Specialization of the base class RWDBExprFormDefinition used to define SQL functions that take 1 parameter. More...
class	RWDBExprFuncDef2
	Specialization of the base class RWDBExprFormDefinition used to define SQL functions that take 2 parameters. More...
class	RWDBExprFuncDef3
	Specialization of the base class RWDBExprFormDefinition used to define SQL functions that take 3 parameters. More...
class	RWDBExprFuncDef4
	Specialization of the base class RWDBExprFormDefinition used to define SQL functions that take 4 parameters. More...
class	RWDBJoinExpr
	Used to build outer join constructs. More...
class	RWDBSearchedCaseExpr
	Used to build searched CASE expressions. More...
class	RWDBSimpleCaseExpr
	Used to build simple CASE expressions. More...

Detailed Description

Class RWDBExpr is a base class for a family of classes that allow you to program SQL expressions in C++. Additional classes in this category include RWDBAssignment, RWDBCriterion, RWDBCollectableExpr, RWDBBoundExpr, and RWDBJoinExpr. The DB Interface Module User's Guide contains examples of using these classes.

The DB Interface Module also provides an extensible mechanism for defining SQL expressions for your specific needs. The classes RWDBExprFormDefinition, RWDBExprFuncDef0, RWDBExprFuncDef1, RWDBExprFuncDef2, RWDBExprFuncDef3, RWDBExprFuncDef4, RWDBCritFormDefinition, and RWDBCritFuncDef0, RWDBCritFuncDef1, RWDBCritFuncDef2, RWDBCritFuncDef3, RWDBCritFuncDef4 support this mechanism.